CALCULUS Understanding Its Concepts and Methods
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An ellipse consists of all the points in a plane, the sum of whose distances to two fixed points (the foci) is constant.
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Copyright © 2006 Darel Hardy, Fred Richman, Carol Walker, Robert Wisner. All rights reserved. Except upon the express prior permission in writing, from the authors, no part of this work may be reproduced, transcribed, stored electronically, or transmitted in any form by any method.